• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 춘계학술대회 논문집
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• pp.349-352
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• 2008

The electrical accidents result from insulation blackdown due to over voltage and overheating due to the excess of allowable current, deterioration of insulation performance due to the passage of time, and so on. In this paper, the insulating characteristics of phenolic resin using insulating materials for low voltage were analyzed and the tracking test was performed according to IEC Publ. 112.

• 한국지진공학회논문집
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• 제12권5호
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• pp.57-63
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• 2008

본 연구는 원자력발전소에 설치되는 캐비닛형 전기기기의 동적 진동시험 자료를 이용하여 캐비닛의 지진응답을 예측할 수 있는 기법을 제안하였다. 제안된 기법은 1) 절점질량 이상화 모델에 기반한 등가 지진하중 산정, 2) 진동시험자료에 기반한 캐비닛 구조의 입출력 상태방정식 규명, 3) 산정된 등가지진하중과 규명된 입출력 상태방정식을 사용한 지진응답산정의 과정으로 구성된다. 제안된 기법은 유한요소기법(FEM) 모델 개선(Model Updating)에 기반한 지진응답예측기법에 비하여 모델링 오차가 개입 되지 않는 장점을 가진다. 캐비넷 구조를 이상화한 2차원 프레임 모델과 3차원 상세 모델에 대한 수치검증을 통하여 제안된 기법이 지진응답을 매우 정확하게 예측을 함을 관찰하였고, 측정 노이즈에 대해서도 강인함을 관찰하였다. 추후연구로 실험검증이 요구된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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• pp.203-205
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• 2005

A reactor protection system (RPS) plays the roles of generating the reactor trip signal and the engineered safety features (ESF) actuation signal when the monitored plant processes reach predefined limits. A Korean project group is developing a new digitalized RPS and the Cabinet Operator Module (COM) of the RPS which is used for the RPS integrity testing and monitoring by an equipment operator. A flat panel display (FPD) with a touch screen capability is provided as a main user interface for the RPS operation. To support the RPS COM user interface design, actually the FPD screen design, we developed a user interface style guide because the system designer could not properly deal with the many general human factors design guidelines. To develop the user interface style guide, various design guideline gatherings, a walk-though with a video recorder, guideline selection with respect to user interface design elements, determination of the properties of the design elements, discussion with the system designers, and a conversion of the properties into a screen design were carried out. This paper describes the process in detail and the findings in the course of the style guide development.

• 한국지진공학회논문집
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• 제28권3호
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• pp.141-147
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• 2024

Earthquakes of magnitude 3.0 or greater occur in Korea about 10 times on average yearly, and the number of earthquakes occurring in Korea is increasing. As many earthquakes have recently occurred, interest in the safety of nuclear power plants has increased. Nuclear power plants are equipped with many cabinet-type control facilities to regulate safety facilities, and function maintenance is required during an earthquake. The seismic performance of the cabinet is divided into structural and functional performances. Structural performance can be secured during the design procedure. Functional performance depends on the vibration performance of the component. Therefore, it is necessary to confirm the seismic performance of the components. Generally, seismic performance is confirmed through seismic simulation tests. When checking seismic performance through seismic simulation tests, it is difficult to determine the effect of frequency and maximum acceleration on an element. In this paper, shaking table tests were performed using various frequencies and various maximum accelerations. The seismic performance characteristics of the functions of electrical equipment components were confirmed through tests.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2179-2181
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• 1999

This paper describes the composition technology of pulsed power system with high current. The capacitor bank, control cabinet, dc charging unit, closing switch and cable system etc. employed with the system components are described. Especially the development of the inverse pinch switch enabled the generation of the very high current.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권3호
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• pp.149-156
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• 2004

This paper deals with the effective protection method for the household electric appliances against lightning surges invading from the Power lines. Direct or induced lightning is the main cause of the breakdown of household electric appliance. The most effective protection method is to install SPDs(surge protective devices) at household electric appliances. If SPDs were not installed at most household electric appliances, it is necessary to install SPDs on the mains. Therefore the propagation aspect and protection methods of lighting surges coming into household electric appliances through the mains was experimentally investigated. The in actual-sized test circuits results of protection method for 8 household electric appliances including computer monitors and TV set could be summarized as follows: The breakdown characteristics of household electric appliances from lightning surges were significantly changed with the their input impedance. Namely, the types of input impedance are classified into infinite, resistive or inductive impedances. Especially, the monitor for computer with inductive input impedance from lightning surges was relatively weak against lightning surges. It was confirmed that the self inductance of branch circuits on the mains have protection effect for household electric appliances against lightning surges invading from the power lines. Also the varistors installed at cabinet panel or circuit-breaker were more effective than multi-tap outlet with varistors. When installed varistors in cabinet panel and multi-tap outlet together, the surge protection effect is much more excellent in technical and economical aspects.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.741-743
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• 2004

In this paper, we describe a Control Element Drive Mechanism(CEDM) operation test using a Power Controller. By testing, we can catch the mechanical and electrical characteristics of CEDM and obtain the information about the improvement of CEDM and the design of CEDM power cabinet. The power controller for CEDM introduced in this paper can input firing angles directly into gate drive circuits of thyristors so that this method can be used to derive the maximum and minimum values of firing angles within available limits for a 3-phase half-wave rectifier. Angle inputs help us understand each coil's response characteristics. Since this power controller generates a serial sequence for CEDM insertion and withdrawal operations, we may judge whether CEDM works correctly as expected or not in each phase of a step movement.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전력기술부문
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• pp.460-462
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• 2008

일반 수용가를 대상으로 한 효율적인 수요관리의 한 방법으로써 Dynamically-Administered Critical Peak Pricing[1] 요금제를 이용하여 일반 수용가 대상 수요관리를 스마트 미터기인 Smart Cabinet Panel(SCP)를 개발하여 적용하였다. 이 DA-CPP 요금제에는 핵심이 되는 최적 critical peak 시점을 푸는 하위 문제들 및 방법론들이 존재하는데, 우리는 energy service provider(ESP)가 관리해야 할 수용가의 수가 매우 많다는 점에 주목하여, 각 수용가의 1일 부하 사용량 패턴을 몇 개의 그룹으로 나누어 각 그룹에 대해 critical peak 최적 시점을 결정하는 연구를 수행하였다. 이러한 수용가 부하량 패턴그룹화를 위해 인공 지능의 여러 기법 중 하나인 self-organizing map(SOM)을 사용하였다 그리고 ESP와 수음가가 통신할 수 있도록 개발된 SCP를 통해 Critical Peak을 적용하였다.

• 가정과삶의질연구
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• 제24권5호
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• pp.89-99
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• 2006

The purpose of this study was to devise guidelines for the kitchen workspace of the aged by examining current usage. To achieve this objective, surveys were conducted and measurement were taken between June 15 and lune 30, 2005. The data were gathered from 50 women over 65- years-old who live in the downtown and suburbs of Seoul, Korea. The collected data were processed using SPSS 12.0 for Microsoft Windows and resulted in the following conclusions: The kitchen for the aged needs to be laid out in ㄱ-shape and the refrigerator needs to be positioned prominently. The height of the work counter is relative to the user's height (${\times}0.49{\sim}056$). and the length varies depending on the available space of the house and the type of work counter needed: however it was found that it should be at least 270cm Concerning the depth of the work counter, the standard sizes (60cm) currently on the market did not cause any inconvenience. It was found that the sink must be designed to allow for some space at the bottom so as to ensure comfortable sedentary work. Also, an electrical oven was preferred over a gas-fuelled one. Finally, the height of the upper cabinet should be relative to the user's height at ${\times}0.85{\sim}1.0$ from the floor to the bottom of the cabinet.

• 전기의세계
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• 제14권4호
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• pp.22-27
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• 1965

우리나라의 speaker제작의 역사는 얼마되지 않을 뿐더러 자급자족의 영역을 못 벗어나고 있다. Weston speaker, 자사내에서 자급자족하고 있는 금성사제 speaker등 완전히 질량의 단계에 못들어가고 있는 실정이다. 그나마 성능면에서도 뒤떨어짐을 면할 수 없는 실정이다 .부속품 예컨데 자철 coil접착제등 거이 매매회사에서 직수입하고 있는 형편인것 같다. 물론 종합공업이 발달해야만 되겠기에 단편적 발달은 기하기 어려울 줄 안다. 그러나 speak의 조립 공정에서 끝마치고 있는 형편이고 보면 한심할 지경이다. 물론 speaker제작이라고 하는 것은 극히 delicacy한 면을 가지고 있다. 즉 효율은 $B^{2}$에 비례하는것은 당연하지만 효율을 높이고저 공기부하의 저항을 크게 할려면 corn의 입경이 크게 되므로 자연적으로 진동계의 질량이 크게되며 또 voice coil의 저항을 적게하자니 coil가 필연적으로 굵게되어 길이가 짧게 될 뿐만아니라 air gap 이 크게되어 자속밀도 B가 적게 되는 상반관계가 있다. Cabinet, baffle, corn, corrugation, speaker system등을 가장 합리적으로 설계할 필요가 있다. 이 실험결과를 보고함으로서 speaker연구에 대한 욕구를 갖고 의욕적인 계기가 되었으면 한다. Voice coil 의 turn수를 바뀌었을때 impedance을 측정하였으며 turn수와 음압level 및 주파수 관계를 알아보았다. 그리하여 중형 speaker의 주파수특성을 알아 설계에 기여하고저 한다.